This patch sets the io_pages bdi hint based on the rsize mount option.
Without this patch large buffered reads (request size > max readahead)
are processed sequentially in chunks of the readahead size (i.e. read
requests are sent out up to the readahead size, then the
do_generic_file_read() function waits until the first page is received).
With this patch read requests are sent out at once up to the size
specified in the rsize mount option (default: 64 MB).
Signed-off-by: Andreas Gerstmayr <andreas.gerstm...@catalysts.cc>
---
Thanks for your input.
Changes in v3:
- set default rsize to 64 MB
- sanity check of the rsize mount option
(Note: This patch depends on kernel version 4.10-rc1)
fs/ceph/super.c | 8 ++++++++
fs/ceph/super.h | 4 ++--
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 6bd20d7..a0a0b6d 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -952,6 +952,14 @@ static int ceph_register_bdi(struct super_block *sb,
fsc->backing_dev_info.ra_pages =
VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
+ if (fsc->mount_options->rsize > fsc->mount_options->rasize &&
+ fsc->mount_options->rsize >= PAGE_SIZE)
+ fsc->backing_dev_info.io_pages =
+ (fsc->mount_options->rsize + PAGE_SIZE - 1)
+ >> PAGE_SHIFT;
+ else if (fsc->mount_options->rsize == 0)
+ fsc->backing_dev_info.io_pages = ULONG_MAX;
+
err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
atomic_long_inc_return(&bdi_seq));
if (!err)
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 3373b61..88b2e6e 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -45,8 +45,8 @@
#define ceph_test_mount_opt(fsc, opt) \
(!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt))
-#define CEPH_RSIZE_DEFAULT 0 /* max read size */
-#define CEPH_RASIZE_DEFAULT (8192*1024) /* readahead */
+#define CEPH_RSIZE_DEFAULT (64*1024*1024) /* max read size */
+#define CEPH_RASIZE_DEFAULT (8192*1024) /* max readahead */
#define CEPH_MAX_READDIR_DEFAULT 1024
#define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024)
#define CEPH_SNAPDIRNAME_DEFAULT ".snap"
--
1.8.3.1
